Benjamin douglas



UNITED sTATEs PATENT oEErcE.

BENJAMIN DOUGLAS, OF MIDDLETOWTN, CONNECTICUT, ASSIGNOR TO YV. DOUGLAS AND B. DOUGLAS, OF SAME PLACE.

PUMP.

Specification of Letters Patent No.

To all whom 'it may concern:

Be it known that I, BENJAMIN DOUGLAS, of Middletown, in the county of Middlesex and State of Connecticut, have invented a new and Improved Construction of Pump; and I hereby declare that the following is `a full and exact description thereof, reference being' had to the accompanying drawings and references marked thereon.

Figure l, is a sectional elevation of the pump. Fig. 2, is a section of that part showing' the position of the check valve and its connections. F ig. 3, is a section of the piston valve. Fig. 4, is a modification of the stirrup part with an additional mode of suction pipe attachment.

Similar parts are represented by the same figures and letters in all the drawings.

The nature of the invention consists in the arrangement of a certain check valve in connection with a certain safety tube by which the upward movement is controlled and by which it (the valve) is kept in a position to discharge the largest amount of liquid from the discharge pipe by deflecting the current horizontally.

In the drawings A represents the pump cylinder; B, the air chamber; C, the handle of the piston rod; D, thestirrup or stand, the arch of which forms the lower valve seat.

E is the piston valve; F, the detachable part of the piston valve used for supplying and removing` the packing (Z, Z,) of the piston valve.

(a, La) is the tube of the air chamber designed to insure the absolute tightness of the air chamber.

(o) is the check valve which plays up and down on the piston rod between the bottom of tube (a, (a) and top part of valve seat (c).

c) is the valve seat constituting the line of division between the cylinder and the air chamber. i

(CZ) is the packing on the upper face of (0); (c) the packing on the lower face of (0); (f) the discharge jet taken from the lower part of the air chamber.

(g) is the lower valve resting in the valve seat in the arch of the stirrup; (h) the valve seat and nozzle of the suction pipe attachment leading to the fountain.

is the piston rod; the nut controlling the packing of the piston at the 30,603, dated November 6, 1860.

top of the air chamber connected with the inner part of tube (a).

(7c Zc) is the screw joint connecting the pump cylinder to the valve seat in the arch of the stirrup; (Z, Z,) the packing of the piston held in place by piece F.

(m) represents the piston valve; (n), the seat of said piston valve.

This pump in the construction of its cylinder and lower part does not materially differ from the ordinary sucking pump, having a fixed valve in the lower part of the cylinder and another in the piston of the usual construction. There is however one peculiarity in fixing the lower valve but which is not made the subject of claim: namely the making of the arch of the stirrup, which constitutes the temporary fastening of the pump, a valve seat held in place by the screwing down of the cylinder upon it. The pecularity of the upper part of the pump is the expanding of the top of the cylinder into an air-chamber of a bell shape; the two being separated from each other by means of a check valve. This arrangement gives to the instrument the power and character of a force pump at once cheap, compact, and' durable; and it is fitted up with the special design of being moved from place to place about the family establishment for washing windows, watering flower gardens, and conservatories, and in case of fires. An apparatus costing some six or seven dollars will throw a stream 60 feet high. This portable form of the pump is operated by direct lifting; the foot being placed. into the stirrup, and the stirrup on the ground, the stream is forced out by the hand pulling upward, by a direct lift at the handle C, and the discharge stream is through the pipe (f). The cylinder, A, be ing of the usual form, is connected to the air chamber, B, by means of screw threads on its outer surface fitting into similar ones on the inner face of the mouth of the chamber, B. On the face of the upper end of the cylinder rests the ring packing (c) and on this last rests the metallic Hat ring (c, 0,) which forms the valve seat of the check valve (b). Above this valve seat rests the packing ring (ci, (2,) and this last is pressed against the shoulder in the mouth piece of the air chamber B, by tightening the screw.

The valve (Z9) as shown in Fig. l, is seen in a sectional elevation, being a ring of metal playing up and down on the piston rod from the valve seat (c, 0,.) to the lower end of the tube (c, a.) As the piston rises in the cylinder, valve (Z2) is forced against (a, a), by the upward pressure of the stream and on the return of the piston the valve is forced against the valve seat by the eX- panding force of the compressed air'in B. The effect of placing this check valve (Z2) in the lower part of the air chamber and directly opposite the discharge opening is to deflect the current of water from the vertical to .the horizontal direction and thereby increase greatly the amount .of the discharge liquid, for if the discharge Atube were placed considerably above .the horizontal level of the valve in the'upper part of its movement, or below that level, the quantity of liquid delivered by the discharge pipe would be very much less than when the valve and the discharge pipe are on the' same horizontal level, for in the latter case the valve deflects the upward moving current horizontally so as to increase the quantity of liquid delivered by the discharge pipe, in consequence of the current striking against the valve and being deflected into the horizont-al direction. Another Aand equally important effect of this location of the 'check valve is, that while the piston is moving downward the valve closes entirely the air chamber from the cylinder chamber so that there can be no return pressure upon the column of water in the cylinder by the eX- pansion of the air in the air chamber. All this air expansion consequently is expended in forcing' the current out at the discharge aperture (f.)

The lower end of the tube (ct, a,) acts as a check in stopping the ascent of the valve (Z2) at the right point and thus performs important servicein this relation, for without this stop the valve might rise to the top of the air chamber, too high to be returned in time to close the opening into the cylinder, as the piston is descending. rThe tube (a, 61,) subserves anotherl important purpose. It insures the tightness lof the upper part of the air chamber, for experience shows that the packing of ,the piston rod in the upper part ofthe air chamber never can be absolutely air tight. And any want of absolutel tightness is fatal to the joint and the air chamber must lill with water very soon.V

designed, and is generally put on a wagon' body, with wheels, costing for this locomotive part, as muchas this whole apparatus. To obviate all these inconveniences, l have made a skeleton frame in theform of a stirrup .broad enough to answer as a stand to sustain the pump, and light enough to be easily transported in one hand from place to place. The arch of the stirrup is cast a little heavier than the vrest so as to be used as a valve seat in its highest part, and allow space for receiving the suction pipe (it) vertically through the arch, as shown in Fig. 3, or curved into .the horizontal direction as shown in Fig. 5.

Having fully described the nature of the invention and the construction and application of the same, what I claim as my invention and desire to secure by Letters Patent 1s- The use of tube (a, 60,) for incasing the piston rod and preventing .the escape of air through the stuffing boX Yaround the piston rod when it also controls the upward movementV of the check valve-,substantially as herein set forth.

BENJAMIN DOUGLAS.

Witnesses:

' L. D. GALE,

EDW. F. BROWN. 

